JP2899915B2 - Settlement method of latent box body and latent box body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a submersion method and a submersion body used in the submersion method, and more particularly to a submersion method capable of sinking the submersion body in a well-balanced manner and a submersible body capable of uniform subsidence.

(Conventional technology) Conventionally, a submerged body subsidence method of excavating and discharging the bottom soil inside the blade opening of the submerged body and submerging the submerged body by its own weight is known.

In this conventional example, excavation of the bottom soil inside the cutting hole including below the tip of the cutting hole, and once discharging the soil, is carried out to the periphery of the latent box body,
Each time, they are transported by truck or other vehicle.

Conventionally, a cutting edge having a triangular cross section is provided around the lower end of the latent box body, but the cutting edge corner according to this conventional example is shown by a dashed line a or a two-dot chain line b in FIG. To increase the strength.

No measures have been taken against the entrapment of the side soil that occurs when the submersible body subsides. Incidentally, the entrapment of the side soil means a phenomenon in which the side soil 6 is entrained as shown by the arrow c when the submersible body 1 sinks as shown in FIG. 9, and this encroachment starts from the topsoil 60, the surface distance is large, and eventually. It extends down the side soil. Further, as shown in FIG. 10, when the latent box body 1 is sunk unequally for some reason and tilts, the entrainment increases in proportion thereto.

(Problems to be Solved by the Invention) The bottom soil is not in a certain state, for example, there is a difference between hard and soft and spring water. As a result, the substructure tends to tilt toward a portion of the bottom soil having a low resistance, that is, to cause uneven settlement. Here, if the weight of the latent body is large, the bottom soil is cut off regardless of various conditions such as the difference between hard and soft, and the land is evenly settled. Will be. In the conventional example, only the own weight of the submersible body or the reaction force of the jack having the underground immovable buried object as a withdrawal resistance is merely added to the own weight, and the occurrence of uneven settlement itself cannot be avoided, and the submerged body is stably provided. Cannot sink. It should be noted that, when unequal settlement has occurred, it has been conventionally performed to add a weight such as an ingot or partially drive the jack to correct it, but this is only for the case where unequal settlement occurs. It is a treatment and cannot prevent the occurrence of unequal settlement.

Further, in the conventional example, since the bottom soil below the tip of the cutting edge is also excavated, the latent box body loses its balance and unequal settlement is likely to occur. Furthermore, in the conventional example, the earth removal is carried out of the submersible body, so it has to be dispatched every time, and it is cumbersome, and furthermore, the earth cannot be discharged without preparing the car, and it is not possible to concentrate on the excavation work. This is even more inconvenient in busy urban areas due to restrictions on roads.

In the conventional example, the bottom soil at the lower end of the cutting edge is excavated. However, since the cutting edge of the corner is thick as described above, it is difficult for workers to reach the corner, and the corner is surrounded by walls from two directions, with the sinking of the latent box body The soil is consolidated, has higher resistance, and is extremely difficult to excavate. As a result, variations occur in the entire excavation, causing uneven settlement of the substructure.

In addition, in the conventional example, since the entire cutting edge provided at the lower end of the latent box body has a triangular cross section, the brake does not work at the time of sinking,
The submersible body is drawn in the direction of low resistance and tends to unequally sink.

Further, since no measures have been taken for the entrapment of the side soil, the adjacent ground is drawn in together with the buried object such as a sewer pipe. In addition, there is unevenness such as hard and soft side soil around the latent box body itself, and the pressure applied to the latent box body due to entrainment is not even. If the submersible body is tilted for some reason as shown in Fig. 10, it will further promote uneven settlement.

(Means for Solving the Problems) The present invention is intended to solve the common problem of unequal settlement of the substructure, and also to solve the other problems described above. Excavating and discharging the bottom soil, in the submersion body subsidence method of submerging the latent box body, a storage means is formed in the latent box body, and the tip of the blade is inserted into the bottom soil while the tip of the blade is inserted into the bottom soil. It is characterized in that the inner peripheral soil is dug to loosen the bottom soil at the tip of the cutting edge, and the discharged soil generated by the excavation is put into the storage means. Second, a floor plate is provided inside. And forming a space for carrying the earth removal between the floor plate and the skeleton wall, and forming a temporary wall protruding from the floor plate to form a storage means for the earth removal. Excavates and discharges the bottom soil inside the blade opening of the submersible skeleton, In the sinking method of the submersible body to be sunk, a recess for excavation work is provided inside the cutting edge corner, the cutting edge at the corner position is formed as a thin blade, a reinforcing material is embedded in the thin blade, and through the concave portion Fourthly, in the submerging method of the submerged frame body for excavating and discharging the bottom soil inside the cutting opening of the submerged frame, and submerging the submerged frame, A resistance plate having a horizontal bottom surface is protruded inward from above a hypotenuse of a cutting edge having a triangular cross section formed around the lower end of the frame, and the latent box is lowered while braking with the resistance plate. Fifthly, in the submersible body subsidence method of excavating and discharging the bottom soil inside the blade opening of the submersible body, and submerging the submarine body, around the position where the submarine body should be submerged, And lay a wall around the topsoil The submerged body is settled, and entrapment of the side soil surface caused by the subsidence is prevented by the wall. Sixth, excavation is performed by excavating the bottom soil inside the blade opening of the submerged body. Then, in the submersible body subsidence method of submerging the latent box body, an upwardly directed injection hole is wrapped around the body wall stepwise and all around, and the submerged body subsidence causes a gap between the body wall and the side earth wall. Sand is supplied to the gap to be formed to fill the gap, and at the same time, the stabilizing liquid is sprayed upward from the spray hole to prevent entrapment of the side soil. Excavating and discharging the bottom soil inside the mouth, in the method of submerging the substructure body to settle the substructure, around the position where the substructure is to be submerged, and surrounding the wall into the topsoil, Upward injection to the skeleton wall Stepwise and around the entire circumference, the submerged body is settled, and the entrapment of the side soil surface caused by the subsidence is prevented by the wall. Sand is supplied to the gap formed therebetween to fill the gap, and at the same time, the stable liquid is jetted upward from the jet holes to prevent entrapment of the side soil.

(Embodiment) In the drawings, reference numeral 1 denotes a latent box body, around which a cutting edge 2 having a triangular cross section as shown in FIG.
As shown in FIG. 3, a recess 22 is provided in the cutting edge corner 21 to form a cutting edge at the corner position on the thin blade 2 'as shown in FIG.
A resistance plate 24 is provided in a protruding manner inward at a cutting edge portion in a range indicated by reference numerals l in FIG. That is, as shown in FIG.
23, a resistance board 24 having a horizontal bottom surface 25 is protruded inwardly, and a reinforcing member 16 made of H steel is buried all around the cutting edge 2. As shown in FIGS. 1 and 2, a floor plate 13 integral with the corridor 17 is formed in the corridor 17. In FIG. 2, the broken line 17 is a floor plate.
The corridor before integration with 13 is shown. Temporary walls 14 and 14 are protruded to the left and right of the floorboard 13 to form the storage means 12, spaces 15 and 15 are formed between the left and right of the floorboard 13 and the skeleton wall 10, and the horizontal members A center hole type jack 40 is installed on the horizontal member 18. In addition, pipe-made conduits 19, 19 # (first section) connected to an ultrahigh-pressure jet liquid generator (not shown)
・ Figure 7 ・ 8) are buried stepwise into the skeleton wall 10 and the cutting edge 2, and are respectively connected to pipes 11 ′, 11 ′ ′ fixed stepwise and in a headband shape to the outward surface of the skeleton wall 10 and the cutting edge 2. The outer ends of the passages 19 are connected to each other, and the injection holes 11, 11,
11… in a staggered pattern and over the entire circumference, each pipe
An upwardly directed passage 10 'is formed above 11'. FIG. 8 is a partial view, and shows a part of the pipe 11 '.
The pipe 11 'extends all around the body wall 10 and the outward surface of the blade port 2. In the figure, reference numeral 4 denotes a well-known open / closed blade type of an example of an immovable underground object. anchor
A root is formed through 41, and 42 is a rod connected to the anchor 41 to transmit the pull-out resistance.The upper part of the rod 42 penetrates the center hole of the jack 40 and is placed on the piston 40a of the jack 40. To the nut 40b. On the other hand, a plurality of H steel support piles 30, 30, 30,... Are embedded at intervals in the side soil 6 around the position where the submersible body 1 is to be laid, and are erected on the stable soil layer 7, Wall 3 at the top of pile 30
And the wall 3 is supported, and the wall 3 is buried in the surface portion of the side soil 6, that is, the top soil 60. This makes it possible to prevent the entanglement body 1 from being caught by the entanglement preventing means consisting of the wall 3 and the supporting piles 30, 30, 30,.
It surrounds. The spacing between the support piles 30, 30, 30,... Is determined according to the hardness and softness of the soil, and the spacing is reduced as the softness increases.

Next, the method of the present invention will be described using the above-described latent box body and the entanglement preventing means.

The latent box body 1 is placed on the ground surrounded by the wall 3, the inner periphery of the blade 2 is excavated, and the jack 40 is started. Here, the submersible body 1 begins to sink into the ground due to its own weight and the pull-out resistance of the underground immovable buried object 4 transmitted by the jack 40. That is, when the piston 40a of the jack 40 tries to extend, the nut 40 integral with the underground immovable
b serves as a wall, which acts in the direction of generating a reaction force and consequently sinking the latent body 1. The reaction force means and the method of promoting settlement by the reaction force itself are known. The reaction force by the jack 40 does not always have to be used together, and the claims include cases where the reaction force is not applied and cases where the reaction force is applied. Also, as shown in FIG.
And while excavating the inner casing 51 of the cutting edge 2 into a groove shape indicated by reference numeral 51 'while supporting the latent box body 1 with the bottom soil 5, the reference numeral 51 "
The soil in the portion indicated by is loosened and the submersible body 1 is settled. Here, the tip 20 of the cutting edge 2 sinks while being supported by the bottom soil 5. In addition, the worker puts his body into the concave portion 22 when excavating the cutting edge corner 21, and digs the inner peripheral soil 51 near the thin blade 2 'in the same manner as described above. For this reason, the cutting edge corner 21 can be sufficiently excavated as in the vicinity of the other cutting edge 2. Then, the earth removal 50 is put into the bucket 26, the bucket 26 is lifted and passed through the space 15, and further raised, and the earth removal 50 is put into the storage means 12. Here, the substructure 1 is weighted by the earth removal 50,
It becomes heavier and cuts not only the low resistance portion of the bottom soil 5 but also the high resistance portion to sink evenly. Further, the latent box body 1 sinks while being braked by the resistance plate 24. Further, when the latent box body 1 starts to sink, the winding starts from the topsoil 60, but the resistance of the wall 3 prevents the winding (primary winding) from starting. Further, a gap 62 is formed between the skeleton wall 10 and the side earth wall 61 due to the sinking of the latent box skeleton 1. Therefore,
The sand 8 is supplied to the gap 62 to fill the gap 62, and at the same time, the generator for the ultrahigh-pressure jet liquid is driven, and the bentonite liquid is jetted as the stable liquid 9 from the jet holes 11, 11,. Here, the bentonite particles fill the gaps between the sands, and the sands 8 become stable and have a cushioning function, thereby preventing entrapment (secondary entrapment) in the side soil 6. After the submerged body 1 is settled, the earth removal 50 in the storage means 12 is intensively carried out, and then the temporary walls 14, 14 are removed.

(Effect of the Invention) According to the first aspect of the present invention, the inner peripheral soil of the cutting edge is dug while the tip of the cutting edge is pierced into the bottom soil, and the bottom soil at the tip of the cutting edge is loosened to settle the latent box body. The submersible body always sinks while being supported, has good stability and can prevent the occurrence of unequal subsidence.Besides, the storage means is formed in advance in the submersible body, and the earth is put into it. In addition, the soil will be evenly settled by cutting not only the part of the bottom soil with low resistance but also the large part, which makes it possible to prevent the occurrence of uneven settlement and to remove the soil caused by excavation. Each time there is no hassle of transporting, it is only necessary to transport intensively after the completion of the subsidence, efficient work can be done, and even if construction is done in a busy city area, the trouble to the neighborhood is minimized Can be.

According to the second aspect of the present invention, since the storage means is provided, by storing the earth removal, the weight can be applied to the latent box body. As a result, the occurrence of uneven settlement can be prevented as in the case of the first aspect. It is suitable for efficient work, and creates a space between the floorboard and the frame wall,
The earth removal can be easily transported, and the storage means is formed by the floor plate and the temporary wall, so that it can be manufactured at low cost and can be easily restored by removing the temporary wall after the submerged body is laid down. .

According to the third aspect of the present invention, it is possible to easily excavate the compacted bottom soil in the vicinity of the cutting edge by entering the cutting edge corner through the concave portion, and it becomes possible to excavate evenly with the other cutting edge portions, and to make the latent box body unequal. Subsidence can be prevented, and the reinforcing material is buried even if the cutting edge becomes a thin blade by the concave portion,
The strength is also large.

According to the fourth aspect of the present invention, since the submersible body is settled while being braked by the resistance plate, even if a part of the cutting edge is applied to the low resistance portion of the bottom soil, it can be stopped by the resistance plate, thereby preventing uneven settlement. be able to.

In the invention of claim 5, since the primary entrapment of the side soil surface caused by the start of subsidence of the substructure is prevented by the wall, the adjacent land and the buried object can be protected without adversely affecting the adjacent land. It is possible to prevent the submerged body from tilting due to the pressure difference at the time of entrainment, thereby preventing uneven settlement.

According to the invention of claim 6, sand is supplied to a gap formed between the skeleton body wall and the side earth wall by subsidence of the latent box body to fill the gap and the stable liquid is jetted, so that the function of the cushion can be exhibited. Secondary entrapment of soil can be prevented beforehand to protect adjacent land and prevent uneven settlement of the submersible body in advance.

According to the invention of claim 7, the primary entrapment of the side soil surface is prevented by the wall, and the secondary entrapment of the side soil is prevented by the sand and the stabilizing liquid, thereby effectively protecting the adjacent land and unequal settlement of the latent box body. Can be prevented in advance.

According to the invention of claim 8, the wall is stable and more effective.

According to the ninth aspect of the invention, in addition to the effects of the first and third to seventh aspects, it is possible to promote the settlement of the latent box body and correct the uneven settlement.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view, FIG. 2 is an AA sectional view, FIG. 3 is a BB sectional view, and FIG. C is an enlarged cross-sectional view, FIG. 5 is a DD enlarged cross-sectional view, FIG. 6 is an EE enlarged cross-sectional view, FIG. 7 is an enlarged vertical cross-sectional view near the injection hole, FIG. Ninth
FIG. 10 shows a roll-in state, FIG. 9 is an explanatory view of a state of a side soil, and FIG. 10 is an explanatory view of a state in which a latent box body has unequally settled. 1 ... Submersible body 1 '... Inside 2 ... Blade 2' ... Thin blade 3 ... Wall 4 ... Underground immovable buried object 5 ... Bottom soil, 6 ... Side soil 7 ... Stable Soil layer, 8 Sand 9 Stable liquid 10 Structural wall 11 Injection hole 12 Storage means 13 Floor plate 14 Temporary wall 15 Space 16 Reinforcement 20 ... Tip of cutting edge, 21 ... Corner of cutting edge 22 ... Recess, 23 ... Oblique 24 ... Resistor board, 25 ... Horizontal bottom surface 30 ... Support pile, 40 ... Jack 50 ... Discharge, 51 …… Inner circumference soil 60 …… Top soil, 61 …… Side soil wall 62 …… Gap

Claims (9)

(57) [Claims] In a submersion method for excavating and discharging bottom soil inside a blade opening of a submersible body, and submerging the submersible body, storage means is formed in the submersible body, and a storage means is formed in the submersible body. While piercing the tip into the bottom soil, digging the inner circumferential soil of the cutting edge to loosen the bottom soil at the tip of the cutting edge, and discharging the soil generated by the excavation into the storage means. Submersion method for submerged body. 2. A floor plate is provided inside, and a space for transporting earth removal is formed between the floor plate and the body wall, and a temporary wall is protruded from the floor plate to form storage means for the earth removal. A submersible skeleton. 3. A submersible body subsidence method for excavating and discharging bottom soil inside a cutting opening of a submersible body, and submerging the submersible body, providing a concave portion for excavation work inside a cutting opening corner to form a corner position. A method of submerging a submersible body, characterized in that a cutting edge is formed in a thin blade, a reinforcing material is buried in the thin blade, and a portion near the thin blade is excavated through the concave portion. 4. A submersible body subsidence method for excavating and discharging bottom soil inside a blade opening of a latent housing body, and submerging the latent housing body, wherein a triangular cross section formed around a lower end of the latent housing body. A submersible body having a horizontal bottom surface projecting inward from above the hypotenuse of the above, and submerging the submersible body while braking with the resistance plate. 5. A submersible body subsidence method for excavating and discharging the bottom soil inside a blade opening of a submersible body, and submerging the submerged body, around a position where the submerged body should be submerged and into the topsoil. A method of submerging a submerged body, wherein a wall is provided around the submerged body, and the submerged body is settled and entrapment of the side soil surface caused by the subsidence is prevented by the wall. 6. The submersible body subsidence method for excavating and discharging the bottom soil inside the blade opening of the submersible body, and submerging the submerged body in a submerged body subsidence method, in which an upwardly directed injection hole is formed stepwise and all around the body wall. The sand is supplied to the gap formed between the body wall and the side soil wall by the sinking of the latent box body to fill the gap, and the stable liquid is injected upward from the injection hole to entrain the side soil. A submersible body subsidence method characterized by preventing stagnation. 7. A submersible body subsidence method for excavating and discharging bottom soil inside a cutting edge of a submersible body, and submerging the submerged body, around a position where the submerged body is to be laid and into the topsoil. A wall is provided, and an upwardly directed injection hole is wrapped around the skeleton wall stepwise and around the entire circumference, and the submerged skeleton is settled and the entrapment of the side soil surface caused by the settling is prevented by the wall, In addition, sand is supplied to the gap formed between the skeleton wall and the side soil wall due to the sinking of the latent box body to fill the gap, and the stable liquid is sprayed upward from the injection hole to entrain the side soil. A submersible body subsidence method characterized by blocking. 8. The method according to claim 5, wherein a plurality of support piles are erected on the stable soil layer, and the walls are supported by the support piles. 9. The method according to claim 1, further comprising: excavating and discharging the bottom soil inside the blade opening of the submersible body, and making the underground immovable buried object a pull-out resistance, thereby promoting the sinking of the submersible body by a reaction force of a jack. , (3), (4), (5), (6) or (7)
Subsidence method of submerged body described.